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首页> 外文期刊>Journal of Nuclear Materials: Materials Aspects of Fission and Fusion >Development of the MFPR/R code for characterization of the rim zone and high burnup structure evolution in UO2 fuel pellets
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Development of the MFPR/R code for characterization of the rim zone and high burnup structure evolution in UO2 fuel pellets

机译:MFPR / R码的开发,以表征RIM区和UO2燃料颗粒中的高燃烧结构演化

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摘要

The MFPR/R code designed for mechanistic modelling of irradiated UO2 fuel, was further developed for characterization of the rim zone and high burnup structure (HBS) evolution in UO2 fuel pellets. The application of the MFPR/R semi-empirical criterion for fuel restructuring, related to the dislocation density threshold, allows calculating the penetration depth of HBS as a function of burnup, in a reasonable agreement with observations. For modelling of the porosity evolution in HBS at the UO2 fuel pellet periphery, the MFPR/R model for coalescence of randomly distributed immobile pores owing to their growth and impingement was further developed and validated. The advanced model considering multiple collisions provides a reasonable consent with experimental data, thus demonstrating the validity of the proposed pore coarsening mechanism in HBS. (C) 2019 Elsevier B.V. All rights reserved.
机译:设计用于照射UO2燃料的机械建模的MFPR / R码,用于表征UO2燃料粒料中的边缘区和高燃烧结构(HBS)演变。 在与观测的合理协议中,在与观测的合理协议中,允许计算与位错密度阈值相关的燃料重组的MFPR / R半经验标准允许计算HBS作为燃烧的函数的函数。 为了对UO2燃料颗粒外周的HBS中的孔隙率发展的建模,进一步开发并验证了由于其生长和撞击而随机分布的固定孔的聚结的MFPR / R模型。 考虑多种碰撞的高级模型提供了具有实验数据的合理同意,从而证明了HBS中提出的孔粗化机制的有效性。 (c)2019 Elsevier B.v.保留所有权利。

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